JPS5819730Y2 - Display device in tape recorders, etc. - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a display device in a tape recorder or the like.

Generally, in a tape recorder, etc., a pinch roller presses a magnetic tape against a capstan rotating at a constant speed to make the magnetic tape run at a constant speed, and a signal is recorded on or from the magnetic tape while it is running at a constant speed. A magnetic tape constant speed running state in which signals are reproduced; and a magnetic tape high speed running state in which the reel shaft of one of the two reels around which the magnetic tape is wound is rotated at high speed to cause the magnetic tape to run at high speed. is obtained, and when the above-described high-speed running state of the magnetic tape is operated so that the above-mentioned magnetic tape runs at a constant speed, the driving force for causing the above-mentioned reel shaft to rotate at high speed is released, and then the above-mentioned magnetic tape is attached to the capstan. is pressed by the pinch roller, the running speed of the magnetic tape reaches such a speed that no undue force is applied to the magnetic tape even if the pinch roller presses the magnetic tape against the capstan. It is known that the standby state 75 can be obtained dynamically.

If the high-speed running state of the magnetic tape is changed to a constant-speed running state without passing through the above-described standby state, the magnetic tape running at high speed will be pressed by the pinch roller against the capstan rotating at a constant speed. Even if the running direction of the magnetic tape is the same, on the downstream side of the capstan, the magnetic tape is running at a faster speed than the rotational speed of the capstan, so there is a risk that the tape will be stretched by a strong force and be cut. This will cause the magnetic tape to loosen on the upstream side of the capstan.

If the running direction of the magnetic tape is different between high-speed running and constant-speed running, the above-mentioned tension force and the above-mentioned slack on the magnetic tape become even greater.

The above-mentioned waiting time is generally a preset time using a circuit consisting of a capacitor and a resistor, or the waiting time used in the old days when the running speed of the magnetic tape was detected by a reel shaft rotation detection device, etc., and the tape reached a predetermined speed or less. It is common to select a speed between the constant running speed of the magnetic tape and the stop 1 of the magnetic tape as a speed that does not apply excessive force to the magnetic tape due to time constraints or as described above.

By the way, in the above-mentioned tape recorder, etc., when the magnetic tape is operated to change from the high-speed running state to the constant-speed running state as described above, there is the above-mentioned standby state, so immediately after the above operation, the magnetic tape is still running. Since the tape recorder does not run at a constant speed, the operator cannot be sure immediately after operation whether or not the tape recorder will operate reliably, giving a sense of uneasiness.

In a tape recorder having an operating mechanism using a contact switch, the above-mentioned sense of anxiety becomes even greater.

The present invention provides a display device for a tape recorder, etc. that eliminates the above-mentioned sense of anxiety, and includes a detection means for detecting the standby state, and a display displayed when the standby state is detected by the means. It is equipped with means.

An embodiment of the present invention will be described below with reference to the drawings.

The figure shows a part of the operation control circuit of the tape recorder, and only the parts related to the present invention are shown.

In the figure, reference numeral 1 denotes a normally open switch for operating the magnetic tape to run at a constant speed. By closing this switch momentarily, transistor 2 is turned off, and when it is turned off, transistor 3 is turned on, and when turned on, transistor 3 is turned on. The base side of the transistor 20 is grounded via the diode 4, and the transistor 3 is kept in an on state.

When this transistor 3 is turned on, if the transistor 5 described later is turned on, the relay 6 is connected to the power supply 1B.
An excitation current flows through the relay, and as is well known, the pinch roller is pressed against the capstan, and driving force for constant speed running is applied to the reel shaft on the take-up side, causing the magnetic tape to run at a constant speed. be done.

Reference numeral 7 denotes a normally open switch for fast forwarding (high speed running) the magnetic tape. By closing this switch momentarily, transistor 8 is turned off, and when turned off, transistor 9 is turned on, and when turned on, the transistor 9 is turned on. The base side of the transistor 80 is grounded through the diode 10, and the transistor 9 is kept in an on state.

When this transistor 9 is turned on, an exciting current flows through the tri-relay 11. Due to the energization of the relay, a driving force for high-speed running is applied to the reel shaft on the take-up side, as is well known, and the magnetic tape is run at high speed.

Reference numeral 12 denotes a normally open switch for stopping the running of the magnetic tape, and by closing this switch only momentarily, the transistor 3 is connected via the diode 13 or 14.
, 90 base side is grounded, the transistor is turned off.

Reference numeral 15 denotes an indicator lamp, and as described above, the transistor 16, which is turned on when the transistor 2 is turned off, supplies current for lighting the lamp to indicate that the tape has been fed at a constant speed.

As described above, when the switch 1 is closed while the relay 110 is energized and the magnetic tape is being fast-forwarded, the base side of the transistor 90 is grounded through the diode 17. This transistor is turned off and the capacitor 18 is charged. Transistor 19 turns on and transistor 20
is turned off, and power supply current is supplied to the oscillator 21 while the transistor 190 is on.

This oscillator 21 outputs a negative pulse, and as a result of this output, the transistor 16, which can be turned on by turning off the transistor 2 as described above, is intermittently turned off, and the indicator lamp 15 is blinked.

During this flashing operation, the transistor 19 is turned on, so that the transistor 5 is turned off and the relay 6 is not energized.

In this way, in the embodiment described above, when the switch 1 is closed in order to make the magnetic tape run at a constant speed while the magnetic tape is being fast-forwarded, the indicator light 15 blinks during the period in which the relay 6 is energized. When the relay 6 is activated and the relay 6 is energized, the indicator light 15 is lit.

In the above embodiment, a case of a fast-forwarding state is described as a high-speed running state, but it can be implemented in the same manner even in a half-rewinding state.

[Brief explanation of drawings]

The figure is a circuit diagram showing an embodiment of the present invention. 15: Indicator light.

Claims (1)

[Scope of utility model registration request] A pinch roller presses the magnetic tape against a capstan rotating at a constant speed to cause the magnetic tape to run at a constant speed,
a magnetic tape constant speed running state in which a signal is recorded on the magnetic tape running at a constant speed or a signal is reproduced from the magnetic tape;
A high-speed magnetic tape running state is obtained in which the reel shaft of one of the two reels around which the magnetic tape is wound is rotated at high speed to cause the magnetic tape to run at high speed, and the high-speed running of the magnetic tape is achieved. When operating the magnetic tape in a constant speed running state, after releasing the driving force that causes the reel shaft to rotate at high speed, the magnetic tape is pressed against the capstan by a pinch roller. A state in which the magnetic tape is on standby in the casing is automatically obtained where the running speed of the magnetic tape is such that no excessive force is applied to the magnetic tape even when the pinch roller presses the magnetic tape against the capstan. A display device for a tape recorder, etc., comprising a detection means for detecting the standby state, and a display means for displaying when the standby state is detected by the means.